Anatomy of a Lookup Table

The following figure illustrates the anatomy of a two-dimensional
lookup table. Vectors or breakpoint data sets and
an array, referred to as table data, constitute
the lookup table.

Each breakpoint data set is an index of input values for a particular
dimension of the lookup table. The array of table data serves as a
sampled representation of a function evaluated at the breakpoint values.
Lookup table blocks use breakpoint data sets to relate a table's input
values to the output values that it returns.